Ščevková , J., J. Lafférsová, J. Dušička, and M. Tropeková. “Variability in the Betula Pollen Concentrations in the Atmosphere of Six Urban Areas in Slovakia in 2018”. Alergoprofil, Vol. 16, no. 2, June 2020, pp. 21-24, doi:10.24292/01.AP.162250620.